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Issue No. 19/August 1, 2008

Soybean Aphids Deserve Some Attention Now
Marked increases in soybean aphid activity have been reported in several midwestern states. Remember that most entomologists firmly support the economic threshold of 250 aphids per plant, even with the current higher prices for soybean.

Numbers of Western Bean Cutworm Adults Captured in Pheromone Traps Have Increased
Is western bean cutworm becoming established as a real threat to Illinois corn production? Accurate association of injury with the causative agent is essential for reliable future insect management plans.

Corn Rootworm Larval Damage in Research Trials Is Noteworthy
Though numbers of western corn rootworm adults seem to be fairly low this year, evidence from research trials indicates that enough larvae have survived to inflict serious injury in some areas.

Other Insect Observations Worth Noting
Scouting is still in order for Japanese beetles in soybeans, corn leaf aphids (particularly where fungicides have been applied to cornfields), whiteflies, and corn borers.

2008 Wheat Crop in the Books
With doublecrop soybeans off to a good start and wheat prices remaining favorable, interest in wheat is expected to stay high this fall.

Will This Corn Crop Mature?
While the weather has generally been good in June and July, development of both corn and soybean is far behind normal, and there is increasing concern about whether crops will mature before the season ends.

Regional Reports
A report is provided this issue for northern Illinois.